auto_link helper fails to parse some URLs with colons

Hi. I just submitted my first patch to fix the auto_link helper from
failing on URLs with colons in the query parameters:

https://www.somesite.com/doku.php?id=gps:resource:scs:start

This has been bothering me since the 1.2.x days.

Rich

Ooops... forgot URL to patch:
http://rails.lighthouseapp.com/projects/8994/tickets/1341-auto_link-helper-fails-to-parse-some-urls-with-colons